Based on ground observation and remote sensing monitoring data,regions appropriate for mowing herbage in the dog days and autumn were predicted and assessed quantitatively,and regions appropriate for mowing herbage we...Based on ground observation and remote sensing monitoring data,regions appropriate for mowing herbage in the dog days and autumn were predicted and assessed quantitatively,and regions appropriate for mowing herbage were divided into comparatively suitable,suitable and optimum areas for mowing herbage. Servicing products can be spread to agricultural and pastoral areas via short message service,broadcasting,radio and network in time,and good service effect can be obtained. However,under the effect of precision rate of medium-term prediction areas,the prediction of some rainfall areas deviates from the actual rainfall areas. After timely correction of weather prediction in 24 and 48 hours,pastoral weather forecast service in mowing herbage regions is improved obviously. Herbage mowed in the dog days is rich in nutrients,but it is rainy in the period,which brings certain difficulties to herbage mowing and airing. Therefore,herdsmen in various regions should pay more attention to local weather prediction and regulate mowing herbage periods in time,and autumn herbage can be mowed if the weather is not suitable for mowing herbage in the dog days.展开更多
[Objective] The research aimed to study the variation characteristics of low temperature and rainy weather in Guangxi during spring sowing period of recent 50 years.[Method] Based on the daily average temperature data...[Objective] The research aimed to study the variation characteristics of low temperature and rainy weather in Guangxi during spring sowing period of recent 50 years.[Method] Based on the daily average temperature data from 1961 to 2010 at 88 meteorological stations in Guangxi,yearly days and end date of low temperature and rainy weather during spring sowing period were carried out statistics.The variation characteristics of low temperature and rainy weather in Guangxi during spring sowing period of recent 50 years were analyzed by using linear tendency calculation,phased analysis,Morlet wavelet analysis and correlation analysis.Moreover,the influences of climate warming on days and end date of low temperature and rainy weather in spring sowing period were analyzed.[Result] The average days of low temperature and rainy weather in Guangxi during spring sowing period from 1961 to 2010 was during 3.5-23.2 d.The regional distribution characteristics were that it was more in northeast and mountain zone,and less in southwest and valley.The regional distribution characteristics of end date were that it was late in northeast and mountain zone,and early in southwest and valley.The days of low temperature and rainy weather in Guangxi during spring sowing period of recent 50 years presented slight decrease trend,and the end date presented slight advancing trend.The phased variation characteristics of days and end date of low temperature and rainy weather were obvious.The days of low temperature and rainy weather from the early 1980s to metaphase of 1990s was obviously more,and the end date was obviously later.After the 1990s,the days of low temperature and rainy weather was obviously less,and the end date was obviously earlier.The days of low temperature and rainy weather had periodic oscillation signals of 4,6,8,10-14 years.The end date had periodic oscillation signals of 6,12-14 years.The days and end date of low temperature and rainy weather in Guangxi during spring sowing period significantly related to average temperature from middle dekad of February to first dekad of April.The climate warming made that the days of low temperature and rainy weather tended to decrease,and the end date tended to advance.[Conclusion] The research provided reference for further understanding the occurrence rule of low temperature and rainy weather,going after profits and avoiding disadvantages,reasonably arranging production,carrying out correlated research.展开更多
Rb/Sr ratio, CaCO\-3 content, organic carbon (C\-\{org\}) concentration, magnetic susceptibility and clay mineralogy of 4.0 m sediments samples recovered from Daihai Lake, northern China, are presented in the paper. W...Rb/Sr ratio, CaCO\-3 content, organic carbon (C\-\{org\}) concentration, magnetic susceptibility and clay mineralogy of 4.0 m sediments samples recovered from Daihai Lake, northern China, are presented in the paper. Weathering and paleoclimatic change history during the last 2300 years is reconstructed in terms of the variations of Rb/Sr ratios in the sediment sequence, including the Little Ice Age and Medieval Warm Period. Our results suggest that the evolution processes of weathering and paleoclimate can be rebuilt in terms of the variations of Rb/Sr ratios in the lake sediment sequence, in combination with magnetic susceptibility, C\-\{org\}, \{CaCO\-3\} contents and clay mineralogy.展开更多
Based on the data of hail,gale,thunderstorm and lightning days in 2 481 stations in China from 1961 to 2016,the spatial and temporal distribution characteristics,periodicity and climate abruption characteristics of fo...Based on the data of hail,gale,thunderstorm and lightning days in 2 481 stations in China from 1961 to 2016,the spatial and temporal distribution characteristics,periodicity and climate abruption characteristics of four kinds of disastrous convective weather in China were analyzed by various mathematical statistics methods. The results showed that in time,the days of four kinds of disastrous convective weather in China decreased,and the hail and thunderstorm days were characterized by " increasing firstly and then decreasing" from 1961 to 2016. The hail,gale,thunderstorm and lightning days in China had oscillation cycles of 3-5,2-3,1-2 and 1-4 a respectively,and the hail and thunderstorm days changed suddenly in 2002 and 1992 respectively. In space,the Qinghai-Tibet Plateau and western Sichuan were the highvalue distribution areas of hail,gale and thunderstorm days. The high-value distribution areas of thunderstorm days were also distributed to the south of the Yangtze River. South China and its southwestern regions at the same latitude were the high-value distribution areas of lightning days. In terms of trend,the hail days in China showed a decreasing trend mainly in the Qinghai-Tibet Plateau. The gale days in China decreased in the east,was unchanged in the central region,and increased and decreased alternately in the west. The thunderstorm days in China increased in Tibet,North China,Chongqing,Zhejiang and northwestern Heilongjiang. The lightning days in China decreased obviously to the south of the Yangtze River. In terms of the fluctuation,the hail days fluctuated greatly in the southeast. The gale days fluctuated greatly to the east of Hu Huanyong line. The thunderstorms days in China fluctuated greatly in the northwest and slightly in the southeast. In addition to the small fluctuation in northern Xinjiang and South China,the lightning days fluctuated greatly in other regions of China.展开更多
化学蚀变指数（chemical index of alteration）（CIA）最早作为判别源岩化学风化程度而提出，随后又应用于对沉积物沉积环境的判定。化学蚀变指数的表达式为CIA={n（Al2O3）／[n（Al2O3）＋n（CaO^＊）＋n（Na2O）＋n（K2O）]}×10...化学蚀变指数（chemical index of alteration）（CIA）最早作为判别源岩化学风化程度而提出，随后又应用于对沉积物沉积环境的判定。化学蚀变指数的表达式为CIA={n（Al2O3）／[n（Al2O3）＋n（CaO^＊）＋n（Na2O）＋n（K2O）]}×100。CaO^＊代表硅酸盐中的CaO，n（CaO^＊）=n（CaO）-n（CO2方解石）-n0．5×n（CO2白云石）-10／3xn（P2O5）。化学蚀变指数样品的选取极为重要，最佳岩性为细碎屑岩，并需清除成岩过程中钾交代作用的影响，以及采用成分变异指数（ICV）来判别沉积再循环作用和沉积物成分被改造的程度。使用A—CN—K三角图解判别物源区的源岩性质和样品钾交代的程度及其风化趋势。黔南-桂北地区南华系的CIA研究表明：该地区南华系下部的长安组其下部CIA值为60～65之间，中部为70～5，上部回落到65—70之间。南华系中部富禄组CIA值高，在85-95之间。南华系上部的南沱组CIA值再次回落到60—65的范围。上述CIA值的变化表明本区南华纪时期自老至新经历多次由干燥寒冷-温暖潮湿气候期的变化。本文据此提出扬子地块南华系新的划分、对比方案。展开更多
基金Supported by Science and Technology Innovation Project of Inner Mongolia Meteorological Bureau(NMQXKJCX201115)Meteorological Innovation Team of Husbandry of Inner Mongolia Meteorological Bureau
文摘Based on ground observation and remote sensing monitoring data,regions appropriate for mowing herbage in the dog days and autumn were predicted and assessed quantitatively,and regions appropriate for mowing herbage were divided into comparatively suitable,suitable and optimum areas for mowing herbage. Servicing products can be spread to agricultural and pastoral areas via short message service,broadcasting,radio and network in time,and good service effect can be obtained. However,under the effect of precision rate of medium-term prediction areas,the prediction of some rainfall areas deviates from the actual rainfall areas. After timely correction of weather prediction in 24 and 48 hours,pastoral weather forecast service in mowing herbage regions is improved obviously. Herbage mowed in the dog days is rich in nutrients,but it is rainy in the period,which brings certain difficulties to herbage mowing and airing. Therefore,herdsmen in various regions should pay more attention to local weather prediction and regulate mowing herbage periods in time,and autumn herbage can be mowed if the weather is not suitable for mowing herbage in the dog days.
基金Supported by Special Item of Climate Variation of China Meteorologcal Administration (CCSF2011-25)Guangxi Science Foundation Item (Guiqingke 0991060)
文摘[Objective] The research aimed to study the variation characteristics of low temperature and rainy weather in Guangxi during spring sowing period of recent 50 years.[Method] Based on the daily average temperature data from 1961 to 2010 at 88 meteorological stations in Guangxi,yearly days and end date of low temperature and rainy weather during spring sowing period were carried out statistics.The variation characteristics of low temperature and rainy weather in Guangxi during spring sowing period of recent 50 years were analyzed by using linear tendency calculation,phased analysis,Morlet wavelet analysis and correlation analysis.Moreover,the influences of climate warming on days and end date of low temperature and rainy weather in spring sowing period were analyzed.[Result] The average days of low temperature and rainy weather in Guangxi during spring sowing period from 1961 to 2010 was during 3.5-23.2 d.The regional distribution characteristics were that it was more in northeast and mountain zone,and less in southwest and valley.The regional distribution characteristics of end date were that it was late in northeast and mountain zone,and early in southwest and valley.The days of low temperature and rainy weather in Guangxi during spring sowing period of recent 50 years presented slight decrease trend,and the end date presented slight advancing trend.The phased variation characteristics of days and end date of low temperature and rainy weather were obvious.The days of low temperature and rainy weather from the early 1980s to metaphase of 1990s was obviously more,and the end date was obviously later.After the 1990s,the days of low temperature and rainy weather was obviously less,and the end date was obviously earlier.The days of low temperature and rainy weather had periodic oscillation signals of 4,6,8,10-14 years.The end date had periodic oscillation signals of 6,12-14 years.The days and end date of low temperature and rainy weather in Guangxi during spring sowing period significantly related to average temperature from middle dekad of February to first dekad of April.The climate warming made that the days of low temperature and rainy weather tended to decrease,and the end date tended to advance.[Conclusion] The research provided reference for further understanding the occurrence rule of low temperature and rainy weather,going after profits and avoiding disadvantages,reasonably arranging production,carrying out correlated research.
文摘Rb/Sr ratio, CaCO\-3 content, organic carbon (C\-\{org\}) concentration, magnetic susceptibility and clay mineralogy of 4.0 m sediments samples recovered from Daihai Lake, northern China, are presented in the paper. Weathering and paleoclimatic change history during the last 2300 years is reconstructed in terms of the variations of Rb/Sr ratios in the sediment sequence, including the Little Ice Age and Medieval Warm Period. Our results suggest that the evolution processes of weathering and paleoclimate can be rebuilt in terms of the variations of Rb/Sr ratios in the lake sediment sequence, in combination with magnetic susceptibility, C\-\{org\}, \{CaCO\-3\} contents and clay mineralogy.
基金Supported by National Natural Science Foundation of China (41801064,71790611)Funds for Research of Atmospheric Sciences in Central Asia (CAAS201804)
文摘Based on the data of hail,gale,thunderstorm and lightning days in 2 481 stations in China from 1961 to 2016,the spatial and temporal distribution characteristics,periodicity and climate abruption characteristics of four kinds of disastrous convective weather in China were analyzed by various mathematical statistics methods. The results showed that in time,the days of four kinds of disastrous convective weather in China decreased,and the hail and thunderstorm days were characterized by " increasing firstly and then decreasing" from 1961 to 2016. The hail,gale,thunderstorm and lightning days in China had oscillation cycles of 3-5,2-3,1-2 and 1-4 a respectively,and the hail and thunderstorm days changed suddenly in 2002 and 1992 respectively. In space,the Qinghai-Tibet Plateau and western Sichuan were the highvalue distribution areas of hail,gale and thunderstorm days. The high-value distribution areas of thunderstorm days were also distributed to the south of the Yangtze River. South China and its southwestern regions at the same latitude were the high-value distribution areas of lightning days. In terms of trend,the hail days in China showed a decreasing trend mainly in the Qinghai-Tibet Plateau. The gale days in China decreased in the east,was unchanged in the central region,and increased and decreased alternately in the west. The thunderstorm days in China increased in Tibet,North China,Chongqing,Zhejiang and northwestern Heilongjiang. The lightning days in China decreased obviously to the south of the Yangtze River. In terms of the fluctuation,the hail days fluctuated greatly in the southeast. The gale days fluctuated greatly to the east of Hu Huanyong line. The thunderstorms days in China fluctuated greatly in the northwest and slightly in the southeast. In addition to the small fluctuation in northern Xinjiang and South China,the lightning days fluctuated greatly in other regions of China.
文摘化学蚀变指数（chemical index of alteration）（CIA）最早作为判别源岩化学风化程度而提出，随后又应用于对沉积物沉积环境的判定。化学蚀变指数的表达式为CIA={n（Al2O3）／[n（Al2O3）＋n（CaO^＊）＋n（Na2O）＋n（K2O）]}×100。CaO^＊代表硅酸盐中的CaO，n（CaO^＊）=n（CaO）-n（CO2方解石）-n0．5×n（CO2白云石）-10／3xn（P2O5）。化学蚀变指数样品的选取极为重要，最佳岩性为细碎屑岩，并需清除成岩过程中钾交代作用的影响，以及采用成分变异指数（ICV）来判别沉积再循环作用和沉积物成分被改造的程度。使用A—CN—K三角图解判别物源区的源岩性质和样品钾交代的程度及其风化趋势。黔南-桂北地区南华系的CIA研究表明：该地区南华系下部的长安组其下部CIA值为60～65之间，中部为70～5，上部回落到65—70之间。南华系中部富禄组CIA值高，在85-95之间。南华系上部的南沱组CIA值再次回落到60—65的范围。上述CIA值的变化表明本区南华纪时期自老至新经历多次由干燥寒冷-温暖潮湿气候期的变化。本文据此提出扬子地块南华系新的划分、对比方案。
